Alert archive / Wyoming / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 64, NWS Riverton, WY

July 18, 2025Natrona County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 18, 2025, 3:42 PM MDT for Natrona County, Wyoming. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 18, 2025, 3:42 PM MDT (21:42 UTC)
Expired: Jul 18, 2025, 4:15 PM MDT
In force: 33 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 137 km from the middle of the area, began a volume at 21:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 18, 12:44 PM MDT, 2 hours 58 minutes earlier.

Area forecast discussion, Jul 18, 12:44 PM MDT, 2 hours 58 minutes before

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Hazardous weather outlook, Jul 18, 2:57 AM MDT, 12 hours 45 minutes before

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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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In the hours before

Special weather statement, Jul 18, 1:13 PM MDT, 2 hours 29 minutes before

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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Jul 18, 1:27 PM MDT, 2 hours 15 minutes before

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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
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</body>
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Special weather statement, Jul 18, 3:25 PM MDT, 17 minutes before

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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 18, 3:29 PM MDT, 13 minutes before

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<head>
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  <title>Service Notice</title>
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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 18, 3:36 PM MDT, 6 minutes before

<!doctype html>
<html lang="en">
<head>
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  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Jul 18, 3:40 PM MDT, 2 minutes before

<!doctype html>
<html lang="en">
<head>
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  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 12:43 PM MDT	Special Weather Statement	RIW	Sublette	47 min
Jul 18, 1:13 PM MDT	Special Weather Statement	RIW	Natrona	32 min
Jul 18, 1:27 PM MDT	Special Weather Statement	RIW	Sublette	33 min
Jul 18, 3:25 PM MDT	Special Weather Statement	RIW	Fremont	35 min
Jul 18, 3:29 PM MDT	Special Weather Statement	RIW	Natrona	31 min
Jul 18, 3:36 PM MDT	Special Weather Statement	RIW	Natrona	24 min
Jul 18, 3:40 PM MDT	Special Weather Statement	RIW	Hot Springs	35 min
Jul 18, 3:47 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Park, Washakie	28 min
Jul 18, 3:55 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Natrona	35 min
Jul 18, 4:11 PM MDT	Severe Thunderstorm Warning	RIW	Hot Springs, Washakie	34 min
Jul 18, 4:26 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Natrona	14 min
Jul 18, 4:46 PM MDT	Severe Thunderstorm Warning	RIW	Washakie	29 min
Jul 18, 5:17 PM MDT	Special Weather Statement	RIW	Johnson	28 min
Jul 18, 5:24 PM MDT	Special Weather Statement	RIW		36 min
Jul 18, 5:24 PM MDT	Special Weather Statement	RIW	Fremont	36 min
Jul 18, 5:56 PM MDT	Special Weather Statement	RIW	Big Horn	34 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2025 Every severe thunderstorm warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.